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A Stygobiont Crab, Chaceus Caecus N.Sp., and Its Related

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A Stygobiont Crab, Chaceus Caecus N.Sp., and Its Related Kftmoires de Biosp«ologie, Tome XVII, 1090, p. 127-134. 127 A STYGOBIONT CRAB, CHACEUS CAECUS N.SP., AND ITS RELATED STYGOPHILE SPECIES, CHACEUS MOTILONI RODRIGUEZ, 1980, (CRUSTACEA, DECAPODA, PSEUDOTHELPHUSIDAE) FROM A CAVE IN THE CORDILLERA DE PERIJA, VENEZUELA r by Gilberto RODRIGUEZ1 and Carlos BOSQUE2 1 Instituto Venezolano de Investigaciones Cientificas Apartado 21827 Caracas 1020-A, Venezuela 2 Departamento de Biologia de Organismos Universidad Simon Bolivar Apartado 89000 ^ Caracas 1080, Venezuela and Sociedad Venezolana de Espeleologia Apartado 47334 Caracas 1041, Venezuela I - INTRODUCTION Since the description by RIOJA (1953) of the first stygobiont crab, our knowledge of the troglobic Brachyura has steadily increased. By HOLTHUIS (1986) last count there were 12 species in the Superfamily Potamoidea that could qualify as stygobionts, i.e., found only in subterranean waters and excluded from epigean biotopes. This number could be considered as conservative, because the distinction between stygobionts, stygophiles and stygoxenes is not an easy task and transitional situations are commonly found. The species of freshwater crabs associated with caves are relatively numerous in Middle America, with 16 species of Pseudothelphusidae (GUINOT, 1988 ; RODRIGUEZ and HOBBS, 1989 a ; RODRIGUEZ and HOBBS, 1989 b) and 3 of Trichodactylidae (RODRIGUEZ, in press) reported to occur in the subterranean waters of Southern Mexico, Guatemala and Belize. But of this number, only the Pseudothelphusid genus Typhlopseudothelphusa and the trichodactylid Rodriguezia mensabak have reached the advanced stage in which the faceted cornea of the eyes disappear. On the other hand, only one stygobiont freshwater crab has been described from South America (RODRIGUEZ, 1985), Neostrengeria sketi, with reduced eyes but presence of pigmented cornea. Recently the Venezuelan Society of Speleology collected a blind pseudothelphusid crab during expeditions carried out in 1987 and 1989 to a karstic area of the Cordillera de Perija, amontanous chain that trends North for 300 km, from its origin in the northern Andes to the Caribbean coast, along the Venezuela-Colombia border. Together with the stygobiont species, a second epigeous one, already known from this cordillera (RODRIGUEZ, 1966), was collected inside the cave. Since the two species are closely related taxonomically, in the present contribution we describe both with some detail to allow for a critical appraisal of the troglobious adaptations in these crabs. We are indebted to Carlos GALAN, Juan NOLLA and Igor ALMEIDA, members of the Venezuelan Speleological Society who carried out a carefull survey of the caves, and to Hector SUAREZ who took part in the second expedition and helped with proccesing of the material. The specimens are deposited in the Reference Collection of the Instituto Venezolano de Investigaciones Cientificas (IVIC), Caracas. 128 Gilberto Rodriguez and Carlos Bosque Fig. 1 - Upper : Chaceus caecus, n.sp., holotype ; lower, Chaceus motiloni, male cl. 23.6 mm from Cueva Punto Fijo Stygobiont and stygophile crabs from Venezuela 129 H - DESCRIPTIONS Chaceus caecus, new species Fig. 1, upper; fig. 2, A-H; fig. 3, A-F. Material - Cueva Punto Fijo, Rio Guasare, Est ado Zulia, Venezuela ; 20 January 1989 ; C. BOSQUE and H. SUAREZ ; 1 male holotype, cl. 17.5, cb. 27.5 mm, 1 male paratype, cl. 16.0, cb. 25.1 mm (IVIC). Same locality ; 15 April 1987 ; Carlos GALAN ; 2 females par a types, cl. 18.9 and 18.2 mm, cb. 29.6 and 28.9 mm (IVIC). Description. Carapace narrower than in other species of the genus (cb/cl = 0.57). The cervical groove is slightly sinuous, thin and deep d is tally, wide and shallow proximaly ; it reaches the margin of carapace where it forms a large emargination. The anterolateral margin has 2-3 papillae behind the outer orbital angle, followed by a notch and a rounded lobe with 5-7 denticles ; behind the cervical notch the margin is provided with denticles interspaced with small papillae arranged in an irregular row. The frontal lobes are rounded, small, continued laterally by a ridge. The median groove is replaced by a shallow and wide depression. The surface of the carapace between the postfrontal lobes, the lateral ridges and the front is depressed, flat, covered with flattened papillae. The upper border of the front is strongly bilobed in dorsal view, with a deep notch in the middle ; the margin of each lobe is somewhat oblique, and consequently the lobes are more advanced near the mid-line. In frontal view the upper margin is slightly inclined towards the mid-line ; the upper and lower margins of the front and orbits are bordered with papillae similar to those of the external orbital angle, giving to the anterior part of the carapace a granular appearance. The lower margin is more advanced than the upper. The surface of the front between the upper and lower margin is narrow. The surface of the carapace is covered by small papillae, not visible to the naked eye, more conspicuous towards the sides. The occular peduncles are conical, tappering to a globular apex, with no traces of pigment or facets ; there is a large empty space inside each orbit. The chelipeds are long and slender. The palm in frontal view is narrower than in other species of the genus. The fingers are long and slender, 0.45 the total length of the chela ; when closed the fingers have a moderate gape between them ; their tip cross ; in dorsal view they are strongly arched inwards ; the fingers have 4 larger teeth proximally and smaller teeth of variable size on its distal half. The ischium of chelipeds are very long, approximately 0.6 the breadth of carapace, its supero-interior margin has an irregular row of small spines that diminish in size proximally, and another irregular row of papillae over the infero-internal margin. The carpus is also elongated and has 1 larger spine and 2-3 minute spines on the inner margin. The fingers have small dark points; the upper surface of the hand and carpus and the external border of the merus are covered by small squamiform papillae which become squamiform tubercles on the proximal half of the merus. The walking legs are long and slender, the largest being those of the third pair (total length approximately 1.5 breadth of carapace) ; in this pair the merus is 4.2 times longer than wide. The dactyli are very long and slender ; there are 5 rows of minute spines, with 7-8 spines in each row ; in the 5th pereiopod these spines increase in size distally, and the last spines of the upper and lateral rows are considerable stronger. There are minute spines on the upper margin of the carpus, and in the r lower and upper margins of the propodus, and small tubercles and squamiform papillae on the upper margin of the merus. The exognath of the third maxilliped is 0.8 the length of the ischium. The orifices of the efferent branchial channels are partly closed by a spine of the yugal angle and by the production of the lateral lobe of the ep is tome. The branchial chamber possess the perforated area or pseudolung characteristic of the Pseudothelphusidae. The first male gonopod is stocky ; its distal end is curved and directed mesial, and thus the gonopore open in a perpendicular plane to the main axis of the appendage. The caudal lobe is rounded, foliose, thickened on the lateral border ; it does not reach the apex of the gonopod. The gonopore is bordered by a strong finger-like projection and a proximal triangular spine; there is a rounded elongated papillae at the base of the finger-like projection. The spines surrounding the gonopore are very few and minute. There is a row of long plumose setae over the lateral side of the gonopod and shorter setae on the caudal basal surface. The second gonopod has the tip excavated and bordered with spinules. r Color. Carapace and pereiopods uniformly light cream, with some dark internal blotches visible through the carapace cuticle, particularly in the proto- and mesogastric area where a large bluish patch is present. 130 Gilberto Rodriguez and Carlos Bosque Fig. 2 - Chaceus caecus, n.sp., male holotype : A, largest cheliped ; B, smaller cheliped ; C, Srd maxilliped ; D, orbital area ; E, antero-lateral angle of carapace ; F, dactylus of 3rd pereiopod ; G, claw of 3rd pereiopod ; H, claw of 5th pereiopod. Etymology. The specific name caecus is from the Latin for blind in reference to the reduced condition of the eyes. Chaceus motiloni RODRIGUEZ, 1980. Fig. 1, lower ; fig. 3 G Pseudothelphusa sp. RODRIGUEZ, 1966, p. 132, fig. 10, pi. 7, fig. 3,4 ; PRETZMANN, 1972, p. 57. Chaceus motiloni RODRIGUEZ, 1980 a, p. 890 ; RODRIGUEZ, 1980 b, p. 329, fig. 73 ; RODRIGUEZ, 1982, p. 38, fig. 14. Material. Cueva Punto Fijo, Rio Guasare, Est ado Zulia, Venezuela ; 20 January 1989 ; C. BOSQUE and H. SUAREZ ; 3 males, cl. 23.6, 23.1 and 21.5 mm, cb. 38.2, 36.9 and 34.7 mm, respectively (IVIC). Cano El Indio, Rio Guasare, Estado Zulia, Venezuela ; 20 January 1989 ; C. BOSQUE and H. SUAREZ ; 1 inmature male, cl. 12.8 mm, cb. 19.6 mm (IVIC). Stygobiont and stygophile crabs from Venezuela 131 The original description of the species (RODRIGUEZ, 1980 a) was based on 2 small males in which the carapace curves strongly downwards anteriorly, hiding the upper and lower borders of the front in dorsal view. This character is due undoubtedly to the poor preservation of the specimens and it should be deleted from the key to the species of Chaceus given by RODRIGUEZ (1980 a). The present material comprises 3 fully mature males and shows several differences with the type material. For this reason a corrected description of the species is given below.
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